1. Department of Preventive Medicine, Kyungpook National University School of Medicine, Korea.
2. Hallym Research Institute of Clinical Epidermiology, Hallym University College of Medicine, Korea.
3. Department of Family Medicine, Daegu Catholic University Hospital, Korea.
4. Department of Occupational and Environmental Medicine, Chonnam National University College of Medicine, Korea.
5. Department of Occupational and Environmental Medicine College of Medicine, Dankook University, Korea.
6. Department of Occupational and Environmental Medicine, Masan Samsung Hospital, Korea.
7. Department of Occupational and Environmental Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Korea.
8. Department of Social·Medicine, Inha University School of Medicine, Korea.
9. Department of Occupational and Environmental Medicine, Hallym University Sacred Heart Hospital, Korea.
10. Department of Preventive Medicine, Dong-A University College of Medicine, Korea.
11. Department of Preventive Medicine, Ewha Womans University Medical School, Department of Social and Preventive Medicine, Korea.
12. Department of Preventive Medicine, Kosin University College of Medicine, Korea.
13. Department of Social and Preventive Medicine, Hallym University College of Medicine, Korea.